Media support
In one example, a media support includes a sheet of elongated suction cups. In another example, a media support includes an arrangement of elongated and/or circular suction cups in which the density of the suction cups varies between different parts of the support.
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This is a continuation of U.S. application Ser. No. 14/908,197 filed Jan. 28, 2016 which is a 35 U.S.C. § 371 national stage filing of international application number PCT/IL2013/051046 filed Dec. 19, 2013, which claims priority to international application numbers PCT/IL2013/050932 filed Nov. 12, 2013 and PCT/IL2013/050639 filed Jul. 28, 2013, each of which applications is incorporated herein by reference in its entirety.
BACKGROUNDLarge format inkjet printers use vacuum tables to hold down foamboard, cardboard and other inflexible or semi-flexible print media for printing. High capacity vacuum pumps are used to develop the hold down forces needed to keep large sheets of such media flat during printing.
The same part numbers designate the same or similar parts throughout the figures.
DESCRIPTIONCorrugated cardboard is widely used to make boxes. Although inkjet printers can print high quality images on corrugated cardboard, it is difficult to hold down corrugated cardboard flat in the print zone for high quality inkjet printing. Consequently, special, more expensive corrugated boards are often used for inkjet printing. A new print media support has been developed to hold down regular, less expensive corrugated cardboard flat for inkjet printing. In one example, the media support uses a sheet of suction cups overlaid on a vacuum table to increase the hold down force applied to corrugated cardboard and other print media. To reduce vacuum leakage and increase hold down forces, the suction cup sheet may include oval or other elongated suction cups or a combination of elongated and circular suction cups arranged so that the density of suction cups varies between different parts of the sheet. The suction cup sheet may be used with existing vacuum tables, thus enabling retrofitting printers already in use for high quality printing on corrugated cardboard. In another example, the suction cups are embedded in or integral to the vacuum table itself.
These and other examples are shown in the figures and described below with reference to supporting print media in an inkjet printer. Examples of the new media support, however, are not limited to inkjet printing or to supporting print media, but may be implemented to support other types of media and for applications other than inkjet printing. The examples shown and described illustrate but do not limit the invention, which is defined in the Claims following this Description.
An “elongated” suction cup as used in this document means a suction cup whose length is greater than its width.
Media support 12 includes a vacuum platen 18 and a suction cup sheet 20 covering platen 18. In the example shown, vacuum platen 18 is configured as a movable, flat plate to support large size print media 16. This type of vacuum platen is commonly referred to as a vacuum table. Vacuum table 18 is moved in the Y direction back and forth under printing unit 14 on a track or other suitable drive system 28, as indicated by arrows 22 in
Holes 30 in vacuum table 18 are operatively connected to a pump or other vacuum source 32 through a network of tubes 34, plenum(s) 36, and controls (not shown). A port 38 at the back of each suction cup 40, 42 is aligned with a vacuum hole 30 when sheet 20 is installed on table 18. In operation, air is evacuated from cups 40, 42 through ports 38 under negative pressure from pump 32 to apply suction to print media 16. Vacuum control valves may be connected to individual suction cups or to groups of suction cups (or both) for vacuum control. For example, if print media 16 does not cover all of the suction cups 40, 42 in sheet 20, then it may be desirable to disconnect the vacuum to the uncovered suction cups to minimize vacuum leakage and thus reduce the capacity needed for pump 32. For another example, it may be desirable for holding some print media 16 to have fewer than all of the suction cups 40, 42 covered by print media 16 actually drawing a vacuum on the media.
For a detachable suction cup sheet 20, any suitable removable fastener may be used to attach sheet 20 to table 18 including, for example, adhesives, magnets or screws 44 shown in
Continuing to refer to the example shown in
Print media 16 is positioned on suction cup sheet 20 with one corner over dense part 50 and adjacent sides aligned over middle density arrays 52 so that the opposite sides of the print substrate are near a line of suction cups in sparse density array 54 as shown in
A suction cup sheet with all circular suction cups is disclosed in international patent application no. PCT/IL2013/050639 titled Media Support and filed Jul. 28, 2013. Although a suction cup sheet with a varying density of circular suction cups such as that disclosed in the '639 application is advantageous compared to regular vacuum tables, it has been discovered that the hold down forces generated in the areas of low density circular suction cups may be undesirably low for some printing applications. Elongated suction cups have been developed for use in lower density areas of the suction cup sheet to boost hold down forces and reduce gaps between suction cups. As best seen in the example shown in the detail views of
Each suction cup 40, 42 is molded or otherwise integrated into sheet body 46. In the example shown, each suction cup 40, 42 includes a flexible ring 56 suspended in a recess 58 with a rim 60 protruding slightly above front surface 62 of body 46 so that cups 40, 42 can flex as suction is applied to print media 16. Rim 60 is formed at the perimeter of ring 56 which surrounds port 38 in space such that ring 56 may flex into recess 58 away from front surface 62 when print media 16 is sucked onto rim 60. Flexible rings 56 help suction cups 40, 42 conform to any waves, undulations and other irregularities typical of corrugated cardboard print media 16 so that each cup 40, 42 maintains a better seal to increase the hold down force.
Also in this example, each cup 40, 42 includes a series of ridges 64 adjacent to vacuum port(s) 38. Suction can pull print media 16 down onto the surface of ridges 64 as ring 56 flexes into recess 58 without blocking port 38. Sheet body 46 may be rigid or flexible depending on the implementation and, although any suitable material and fabrication technique may be used to form sheet 20, it is expected that a molded plastic sheet 20 will be desirable and cost effective for most printer implementations.
Testing indicates that, for the same vacuum line pressure, the hold down force applied by a circular suction cup 40 such as that shown in
In the example shown in
In the example shown in
“A” and “an” as used in the Claims means one or more.
The examples shown in the figures and described above illustrate but do not limit the invention, which is defined in the following Claims. Other forms, details, and examples may be made and implemented. Therefore, the foregoing description should not be construed to limit the scope of the Claims.
Claims
1. A media support, comprising a sheet of elongated suction cups, wherein:
- each elongated suction cup has a length in a first direction, a width in a second direction orthogonal to the first direction, and a depth in a third direction orthogonal to the first and second directions, the length being greater than the width, and each elongated suction cup having a port through which air may be evacuated from the elongated suction cup with each port separate from the port of any other elongated suction cup; and
- the sheet includes circular suction cups each having a port through which air may be evacuated from the circular suction cup, with a first array of only circular suction cups grouped together in one corner of the sheet and an array of only elongated suction cups in another part of the sheet, the suction cups in the first array of only circular suction cups arrayed in a first density and the suction cups in the array of only elongated suction cups arrayed in a second density less than the first density.
2. The media support of claim 1, with a second array of only circular suction cups arranged in a series of lines along only two sides of the sheet that meet at the one corner.
3. The media support of claim 1, wherein the sheet comprises a flexible sheet.
4. The media support of claim 1, wherein the length of each elongated suction cup is oriented parallel to the length of each of the other elongated suction cups.
5. The media support of claim 1, wherein the length of some of the elongated suction cups is oriented perpendicular to the length of other of the elongated suction cups.
6. A media support, comprising:
- a platen having an array of vacuum holes therein through which vacuum may be applied to media on the platen; and
- a sheet of elongated suction cups covering the platen, wherein each elongated suction cup has a length in a first direction, a width in a second direction orthogonal to the first direction, and a depth in a third direction orthogonal to the first and second directions, the length being greater than the width, and each of the elongated suction cups having a port through which air may be evacuated from the elongated suction cup with each port separate from the port of any other elongated suction cup and each port aligned to a vacuum hole on the platen so that vacuum may be applied to the elongated suction cup through the vacuum hole;
- wherein the sheet includes circular suction cups each having a port through which air may be evacuated from the circular suction cup and aligned to a vacuum hole on the platen so that vacuum may be applied to the circular suction cup through the vacuum hole, with an array of only circular suction cups grouped together in one corner of the sheet and an array of only elongated suction cups spread over another part of the sheet, the array of only circular suction cups arrayed in a first density and the array of only elongated suction cups arrayed in a second density less than the first density.
7. The media support of claim 6, wherein the sheet is detachable from the platen.
8. The media support of claim 6, wherein each elongated suction cup includes a flexible ring surrounding the port in a recess such that the ring may flex into the recess when suction is applied to media supported on the sheet.
9. The media support of claim 1, wherein some or all of the elongated suction cups are oval suction cups.
10. The media support of claim 1, wherein some of or all of the elongated suction cups are L shaped and the port of each L shaped suction cup is located at the corner of the L.
11. The media support of claim 6, wherein the sheet comprises a flexible sheet detachable from the platen.
12. A media support, comprising:
- a platen having an array of vacuum holes therein through which vacuum may be applied to media on the platen; and
- a flexible sheet having elongated suction cups and circular suction cups therein covering the platen, wherein each elongated suction cup has a length in a first direction, a width in a second direction orthogonal to the first direction, and a depth in a third direction orthogonal to the first and second directions, the length being greater than the width, and each of the suction cups having a port through which air may be evacuated from the suction cup with each port separate from the port of any other suction cup and each port aligned to a vacuum hole on the platen so that vacuum may be applied to the suction cup through the vacuum hole, the elongated suction cups arranged in a first array over a first part of the sheet and the circular suction cups arranged in a second array over a second part of the sheet not overlapping the first part of the sheet.
13. The media support of claim 12, wherein the second part of the sheet includes one corner of the sheet and some or all of the circular suction cups in the second array are grouped together in the one corner.
14. The media support of claim 13, wherein the in the first array is less dense than the second array.
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Type: Grant
Filed: Feb 15, 2019
Date of Patent: Feb 4, 2020
Patent Publication Number: 20190176493
Assignee: HP SCITEX LTD. (Netanya)
Inventors: Alex Veis (Kadima), Yaron Dekel (Gan-Yeoshaya), Yuval Dim (Moshav Haniel)
Primary Examiner: Alejandro Valencia
Application Number: 16/277,776
International Classification: B41J 11/00 (20060101); B41J 11/06 (20060101); B41J 13/00 (20060101); B41J 13/22 (20060101);